A Model for Cavity Induced Errors with Wavefront Slope in High Accuracy Spherical Fizeau Metrology (ABSTRACT)
ABSTRACT: The random ball test for calibrating interferometer transmission spheres was reported about 8 years ago but there did not appear to be an ideal ball. Now, nearly ideal balls are available. The paper describes commercially available hardware for performing the random ball test and example results from the test.
ABSTRACT: Bessel beams have found use in the alignment of transmissive optics for some time. They are also used for the alignment of reflecting optics when used in the imaging mode, that is, when the wavefront is near spherical. However, there are cases where it would be useful to use the Bessel beam for alignment of far-off axis aspheres to order to get the asphere aligned close enough to its final position that light will go through the system in the imaging mode. In another mode, the Bessel beam is used to determine the normal to a free form surface.